5 letters:
atomy

8 letters:
anatomie

9 letters:
uvulatomy

10 letters:
bdellatomy

11 letters:
andranatomy

12 letters:
microanatomy, neuroanatomy, pathoanatomy

5 letters:
ataxy, agony, laxly

6 letters:
apogee, sanity, cavity, galaxy, laxity, apathy, satiny, abbacy, antony, lazily, anomie, saxony, malady, family, canopy, vanity, agassi, cagily, mccabe

7 letters:
happily, capably, nastily, anthony, tragedy, opacity, balcony, gascony, balmily, fallacy, gravity, rapidly, faculty, calumny, valency, atrophy, amnesty, majesty, edacity, maggoty, angrily, cadency, analogy, academy, sassaby, agilely, tammany, reality, fantasy, handily, tastily, cannily, alchemy, affably, manatee, cavalry, rackety, faddily, inanity, natalie, ratafee, tattily, wackily

8 letters:
tonality, tapestry, axletree, modality, casually, phantasy, scammony, chastity, vitality, craftily, banditry, fugacity, casualty, actually, diastole, alacrity, sagacity, gravelly, travesty, audacity, nascency, damnably, locality, nasality, absently, vivacity, calamity, legality, mangabey, scantily, insanity, totality, flashily, rhapsody, falconry, tangency, passably, patently, rapacity, capacity, gadgetry, valiancy, basketry, sodality, manfully, finality, randomly, morality, examinee, salacity, voracity, strategy, rascally, chattily, jaggedly, lambency, pallidly, raggedly, sacristy, scrabbly, urbanity

9 letters:
sexuality, gallantly, cabinetry, formality, blasphemy, unhappily, brutality, concavity, actuality, depravity, rampantly, unreality, captaincy, mentality, joviality, patchouli, mortality, stagnancy, geniality, bashfully, halfpenny, valiantly, naturally, mammalogy, callously, frugality, pugnacity, anxiously, philately, gallantry, scrappily, profanity, lethality, animality, pageantry, normality, tactfully, carnality, plangency, baptistry, irreality, laughably, loquacity, rascality

10 letters:
cordiality, thankfully, triviality, asexuality, factuality, rationally, araliaceae, compatibly, incapacity, musicality, liberality, baptistery, neutrality, inhumanity, nationally, bankruptcy, anastrophe, sensuality, generality, partiality, box family, chaplaincy, dextrality, elm family, in reality, ivy family, logicality, lyricality, pea family, rue family, severality, spatiality, tactlessly, tea family, typicality, unmanfully, yam family, yew family

11 letters:
fractiously, criticality, abnormality, catastrophe, alismatidae, pertinacity, nationality, practically, commonality, elaborately, disassembly, hylobatidae, hospitality, type family, bisexuality, oral cavity, pulp cavity, unnaturally, financially, aloe family, arum family, atypicality, bird family, class musci, dapple-grey, fern family, fish family, flax family, form family, hemp family, iris family, lily family, mark antony, mint family, moss family, palm family, physicality, pine family, pink family, prodigality, rose family, rush family, temporality, verticality, worm family

12 letters:
perspicacity, congeniality, royal family, unilaterally, subnormality, bilaterality, universality, practicality, spirituality, nasal cavity, irrationally, juglandaceae, municipality, philanthropy, aster family, beech family, birch family, caper family, chest cavity, clinodactyly, conviviality, corporeality, dappled-grey, ebony family, ephemerality, essentiality, gourd family, grass family, heath family, holly family, illiberality, illogicality, incompatibly, lower saxony, maple family, olive family, peony family, plant family, polytonality, poppy family, potentiality, sedge family, sinistrality, sumac family, untypicality, whimsicality

13 letters:
homosexuality, substantially, immateriality, irrationality, amaranthaceae, underhandedly, spiral galaxy, artificiality, aerophilately, balsam family, banana family, bodily cavity, cactus family, carrot family, daphne family, first balcony, fungus family, ginger family, horizontality, horse cavalry, laurel family, legume family, linden family, madder family, mallow family, mammal family, myrtle family, naval academy, nettle family, nutmeg family, orchid family, papaya family, pelvic cavity, pepper family, potato family, reciprocality, sesame family, solar gravity, spurge family, theatricality, tupelo family, upper balcony, violet family, walnut family, willow family

14 letters:
superficiality, understandably, incorporeality, satisfactorily, substantiality, nuclear family, ambystomatidae, territoriality, dimensionality, as a formality, begonia family, cylindricality, cypress family, cyrilla family, dogbane family, dogwood family, french academy, gentian family, impracticality, inessentiality, mental faculty, mollusk family, mustard family, nonsensicality, orbital cavity, police academy, quassia family, redwood family, reptile family, second balcony, sense modality, sesquipedality, touch modality, travel rapidly, tubular cavity, uncongeniality, uterine cavity, verbena family, with formality

15 letters:
total depravity, tympanic cavity, amniotic cavity, thoracic cavity, confidentiality, extended family, virtual reality, internationally, amaranth family, bacteria family, cleavage cavity, conjugal family, corkwood family, duckweed family, eelgrass family, foxglove family, geranium family, magnolia family, mahogany family, mangrove family, mental capacity, milkweed family, mulberry family, oleaster family, plantain family, plato's academy, pokeweed family, primrose family, psychosexuality, rockrose family, sensory faculty, sexual morality, tamarisk family, valerian family, visual modality

16 letters:
infant mortality, pathetic fallacy, specific gravity, circumstantially, insubstantiality, abdominal cavity, channel capacity, military academy, milky way galaxy, amaryllis family, amphibian family, arrowroot family, arthropod family, buckthorn family, buckwheat family, buttercup family, carnation family, goosefoot family, grapevine family, horsetail family, mistletoe family, pineapple family, plea of insanity, seating capacity, unsatisfactorily, ununderstandably

17 letters:
center of gravity, centre of gravity, air force academy, auditory modality, bellflower family, gooseberry family, grass tree family, rhinoceros family, without formality

18 letters:
honeysuckle family, loosestrife family, mechanized cavalry, olfactory modality, one-dimensionality, two-dimensionality

19 letters:
segmentation cavity, electrical capacity, genetic abnormality, intracranial cavity

20 letters:
third-dimensionality, three-dimensionality, winter's bark family

22 letters:
congenital abnormality